Many people face the problem of disassembling this device, here is my comment on this topic,

1. Loosen the screws and carefully remove the potentiometer knobs.

A problem may arise at this point: the potentiometer shaft may break off.

2. Now push the casing portion from the back; it should begin to slide downward.

3. About halfway through this movement, it will stop. Lift the casing to continue moving.

4. After removing the casing, remove the modules by unscrewing the screws inside.

5. Now let's try to repair the broken potentiometer.

Now, super important! When disassembling, pay attention to the black dielectric washers. You must put them back when reassembling the module, because if you forget them, there's a high chance of shorting the module's power lines to ground.

A broken shaft can easily be repaired by slightly flattening the back of the shaft.